My quest to create new Rails 3 Double Sided Polymorphic Gem

Polly.rb

# Ok, I'm creating a paired down version of Has_Many_Polymorphs in Rails 3 and making use of Arel. A great way to learn!
# Super simple setup:

class Content < ActiveRecord::Base
  polly :parents => :posts, :children => [:images, :paragraphs, :quotes]
end

class Post < ActiveRecord::Base
end

class Image < ActiveRecord::Base
end

class Paragraph < ActiveRecord::Base
end

class Quote < ActiveRecord::Base
end

# Post has many :images, :paragraphs, and :quotes and many polymorphic children.

p = Post.first # => #<Post>

p.children # => Currently returns an array of records returned from a special Arel table to select the polymorphic data

p.children.order('contents.order ASC') # => I would like this to append order() to the Arel table, then return the results

p.children.where('contents.approved = ?', true).order('contents.order ASC') # => I would like this to append both where() and order() to the Arel table, then return the results

# My question is this:
# How can I extend the sweetness of ActiveRecord to allow chaining of finder methods to an existing Arel table, then automatically execute the Arel SQL rather than returning an Arel table?